<%@ page contentType="text/html;charset=UTF-8" %>
<html><body bgcolor=yellow>
<%! double a=3,b=4,c=5;%>
<BR>加载triangle.jsp计算三边为<%=a%>,<%=b%>,<%=c%>的三角形面积：
<jsp:include page="triangle.jsp" flush="true">
    <jsp:param name="sideA" value="<%= a %>" />
    <jsp:param name="sideB" value="<%= b %>" />
    <jsp:param name="sideC" value="<%= c %>" />
</jsp:include>
</body></html>